Honeywell 04230-A-1001 - Page 60

60
MAN0530 Issue 15 - 07/17 Searchline Excel
2104M0506
where:
Int(lel.m)
xl
 = IntegratedLEL.mreadingoutputbySearchlineExcelinLEL.m.
L
cell
= Lengthofcellinmetres.
Conc
gas
 = Gasconcentrationin%v/v.
LEL
gas
 = LowerExplosionLimitofthegasin%v/v.
The test gas must be the same as the test gas used during the factory calibration of the
Searchline Excel unit and ideally the concentration should be between 2 and 5 LEL.m and
never below 1 LEL.m.
Note: Where a different test gas is used, the typical value for cross-sensitivity is not sufciently
precise to enable valid calibration checks to be performed using the Gassing Cell,
however, response tests can be easily performed with the plastic Test Filters as described
in section 5.1.2.
WARNING
Take the necessary precaution to ensure safety when dealing with these
high concentration gasses.
The gassing cell supplied by Honeywell Analytics (Part No: 2104B2326) is 0.15m long and the
following table outlines the response expected when using this gassing cell:
Gas type LEL Concentration Calculated 4-20mA output
of the gas applied response with
0.15m gas cell.
Methane 5.0 %v/v 100 %v/v 3 LEL.m 13.6mA
Ethane 3.0 %v/v 50 %v/v 2.5 LEL.m 12mA
Propane 2.0 %v/v 50 %v/v 3.75 LEL.m 16mA
Butane 1.5 %v/v 50 %v/v 5 LEL.m 20mA
Gas type LEL Concentration Calculated 4-20mA output
applied Response
Ethylene 2.7% 54% 3 LELm 13.6mA
Propylene 2.0% 50% 3.75 LELm 16mA
Butadiene 2.1% 42% 3 LELm 13.6mA
WARNING
Thesegasesareammableand/ortoxic.
Take appropriate precautions when handling.
4. MAINTENANCE